In order to compare the quality of the SU(5) fit to the results of
previous MasterCode analyses of competing models [1]}, we follow
the prescription used there of subtracting from the total \(\chi ^2\)  given
in Table REF  and Fig. REF , namely 100.34,
the \(\chi ^2\)  contributions originating from
HiggsSignals [2]}, which dominate the global \(\chi ^2\)  function
and would bias the analysis. Fig. REF  lists 36 separate contributions to the total \(\chi ^2\)  function.
The first 3 (\(m_t, M_Z\) , and \(\Delta \alpha _{\rm had}^{(5)} (M_Z)\) ) are treated as nuisance parameters
and the two LHC MET constraints at 8 and 13 TeV are applied as a single constraint.
Omitting the HiggsSignals constraints in our determination
of the number of degrees of freedom leaves 30 constraints,
with 7 parameters for the SU(5) model and hence 23 degrees of freedom.The \(\chi ^2\)  contributions from the
relevant constraints sum to \(32.39\) , corresponding to a \(\chi ^2\)  probability of 9%.
This can be compared with the \(\chi ^2\)  probability values of \(11,12,11\)  and 31%
found in [1]} for the CMSSM, NUHM1, NUHM2 and pMSSM10, respectively,
using LHC Run 1 constraints.
However, as in [1]}, we stress that these \(\chi ^2\)  probabilities
are only approximate since, for example, they neglect correlations
between the observables. A more complete treatment
using toys is beyond the scope of this work.
